GPG 3700 User manual

3700
Bench top Conductivity/TDS Meter
OPERATION UIDE

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CONTENTS
1. INTRODUCTION....... 2
2. TECHNICAL SPECIFICATIONS. … 2
3. INSTRUMENT STRUCTURE...... 3
4. SETTING AND OPERATION...... 5
5. MAINTENANCE............ 6
6. THE USE SITUATION OF CONDUCTIVITY SENSOR.. 7
7. WARRANTY... 7
8. STANDARD CONFIGURATION......... 8

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3700 Bench Top Conductivity/TDS Meter
1. INTRODUCTION
T e 3700 is a microprocessor controlled conductivity and TDS
measurement instrument. T e unit utilizes a multifunction LCD to display
readings and provide feedback to t e user. Instrument configuration
utility electrode older make t e operation more convenient. It can be
used to measure t e conductivity, TDS, temperature value of t e
solution in colleges and universities, ospital, researc institutes,
environmental monitoring laboratory, industrial and mining enterprises
and ot er departments
2. TECHNICAL SPECIFICATIONS
(1) Ranges of measurement：Conductivity
0.00~19.99 us/cm (k=0.01)
20.00~199.9 us/cm (k=0.1)
2.00~20.0 ms/cm (k=1.0)
20.0~200 ms/cm (k=10)
TDS
0.00~19.99 mg/l (k=0.01)
20.00~199.9 mg/l (k=0.1)
2.00~20.0 mg/l (k=1.0)
20.0~200 mg/l (k=10)
Temperature
0 ~100℃

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(2) Resolution: 0.01 us/cm ~0.1 ms/cm, 0.1℃
(3) Accuracy：±1 % F.S
(4) Linearity：±1% of range
(5) Repeatability：±1% of range
(6) Temperature compensation type：Auto / manual 0℃ to 100℃
(7) Dimensions (l*b* )：240 × 180 × 70 mm
(8) Weig t：1.0 kg
(9) Ambient Operating temperature：0~55℃
(10) Humidity：≤95%
(11) Power supply：DC9V, using AC adapters, AC220V, 50Hz
3. INSTRUMENT STRUCTURE
T e front of instrument
1----- Host
2----- Display screen
3----- Keyboard
4----- Electrode older
5----- Electrode
Figure 1 : instrument structure

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6----- Electrode pedestal
T e back of instrument
7----- Conductivity electrode socket
8----- Spare
9----- Temperature electrode socket
10----- Power switc
11----- DC 9V power socket
Keyboard instruction
Button Function
COND/TDS “COND/TDS” switc button, COND and TDS
measuring mode switc .
TEMP
SET
"Temperature" button, to manually set t e
temperature. W en t e temperature electrode is
access it is automatic temperature compensation,
t is button doesn't work.
CONSTANT
Electrode constant, 0.01 , 0.1 ,1.0 ,10.0 could be set
according to t e electrode.
Calibration is also adjusted in CONSTANT.
△
UP
"UP" button, press t e "△" to adjust t e value to rise.
Press t is button in calibration condition to c oose
t e value of t e constant.
▽
DOWN
"DOWN" button, press t e "▽" to adjust t e value to
decline. Press t is button in calibration condition to
c oose t e value of t e constant.
ENTER
"ENTER" button, press t is button to confirm t e
previous step operation. Hold down t e "ENTER"
button w en open t e power switc can restore t e
factory Settings.

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4. SETTIN AND OPERATION
4.1 The Instrument Calibration
a) Pull out BNC s ort-circuit plug from measure electrode socket.
b) Insert electrode in t e measuring electrode socket.
c) Open t e power switc , press t e “COND/TDS” button start
measurement state.
d) T e instrument adopts one point calibration met od.
Press t e "CONSTANT" button , LCD screen s owed below.
● Electrode constant, press "△" and "▽" button to c oose 0.01 ,
0.1 ,1.0 ,10.0 according to t e electrode, press "ENTER" button to confirm.
● Calibration coefficient, press "△" and "▽" button to adjust t e value
press "ENTER" button to confirm.
For example: sample value=350us/cm measure value=346us/cm
Calibration coefficient=350/346=1.011
e) Press t e "TEMP", enter into t e temperature adjustment state, t e
temperature display position, press t e "UP" key or "DOWN" key to
adjust t e temperature display numerical rising or falling, uniform
temperature display value and solution temperature, and t en press
"ENTER" button, confirm back to measure after solution temperature
measurement state.
Note: when the temperature electrode is access, "TEMP" button

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doesn't work, the instrument into the automatic temperature
compensation, the temperature of the displa is the solution
f) After clean wit distilled water, t e electrode can be used to test
solution.
4.2 Measuring the value
After t e calibration of t e instrument, can be used to measure and test
solution. Immerse t e electrode in t e test solution, stirring solution wit a
glass rod, make it uniform, read t e reading of t e solution on t e LCD
screen. Press t e “COND/TDS” button if TDS need to be measured.
5. MAINTENANCE
Instruments frequently correct use and maintenance, to ensure t e
instrument normal and reliable to use, especially t e pH meter t is kind
of instrument, it as t e very ig input impedance, and using t e
environment to be often contact c emicals, so it need more reasonable
maintenance.
1, T e input port of t e instrument (measuring electrode socket) must be
kept dry and clean. W en instrument is not in use, insert t e plug of
BNC s ort-circuit outlet, to prevent dust and moisture get in.
2, W en in measuring, t e electrode wire s ould remain still, ot erwise it
will cause unstable measurement.
3, Instrument used MOS integrated circuit, so it s ould be to ensure t at
t e soldering iron ave good grounding w en in repairing.
4, W en using t e buffer solution to calibrate instruments, please ensure
t e reliability of t e buffer solution, don't make t e wrong buffer solution,
ot erwise will lead to a measurement error.

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6. THE USE SITUATION OF CONDUCTIVITY SENSOR
the conductivit of different liquid in 25℃
7. WARRANTY
Products manufactured by GOLDPOINT company Ltd. are guaranteed
for a period of one year from t e date of delivery. Goods for attention
under guarantee must be returned to t e factory carriage paid and, if
accepted for free repair, will be returned to t e customer’s address free
of c arge.
All sensors made by GOLDPOINT company Ltd. are t oroug ly tested
to t eir publis ed specification before delivery. As we ave no control
over t e conditions in w ic t eir sensors are used, no furt er guarantee
is given.
Situation Conductivity
Pure water 0.05 us/cm
Boiler water 0.05~1 us/cm
Deionized water 0.5 us/cm
Distilled water 0.1~10 us/cm
Softened water 1~80 us/cm
Mineral water 10 us/cm
Beverages 0. 5~1 ms/cm
Waste water 0. 9~9 ms/cm
KCL Solution 1.4ms/cm
Brine 1~80ms/cm
Industrial process water 7~140ms/cm
Seawater 53 ms/cm
10%NaOH 355 ms/cm
31%HNO3 865 ms/cm

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8. STANDARD CONFI URATION
 Benc Top Conductivity/TDS meter 3700
 Conductivity/TDS electrode
 AC220V to DC9V power adapter
 Operation guide
 Inspection report

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OLDPOINT COMPANY LTD.,(TAIWAN) AUTHORIZED
ADD: 4F-1, NO.177, Sec.1, Heping East Road, Taipei
TEL: [phone]/08/09/10
FAX: [phone]
OLDPOINT (SHAN HAI) COMPANY LTD., MANUFACTURIN
ADD:B601,NO.555,Fa uaz en Road,s ang ai
TEL: [phone]
FAX: [phone]
Web：www.igpg.com.cn / www.goldpointgroup.com
Email: s ang [email protected].cn